The effort was similar in some ways to NBC Radio's News and Information Service, mostly national news programming with cut-ins for individual stations to broadcast local news.

Substitute anchors for the program during Sawyer's tenure when she was away or on assignment, in addition to Vargas, included David Muir (who by that point, anchored the weekend editions of World News and served as a weekday correspondent), George Stephanopoulos, Cynthia McFadden, Dan Harris, Paula Faris and Byron Pitts (with the exception of McFadden, who left ABC News in August 2014, most of these anchors/correspondents have also served as substitutes following Muir's appointment as anchor of the program).
I actually think this is a little more complicated than it initially appears - and again gets to the necessity of creating databases about people who have not opted in to Meta which I mentioned above. Consider installing a basketball goal in the driveway, and have a baseball and a couple of mitts lying around for impromptu games of catch in the backyard.
The bullet catch is what it sounds like. Built-up powder caused both the blank and the real bullet to fire simultaneously.